This structure among the trees was the result of divine inspiration.

Live long and prosper in Tennessee.

One of the few surviving "Wigwam"-themed motels.

The world's longest known cave system.

Symbolic attempt to overcome the issues of life.

Patrick Dougherty's fantastic living tree sculptures, mind-blowing but temporary.

One man's vision and a labor of love of many.

The only freestanding table rock formation east of the Mississippi.

Display that gathers the basic elements of the universe in one convenient location.

The largest historic preservation organization in the United States.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

A bypass decorated with large wooden troll carvings.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A six-story-tall golden pyramid, surrounded by a moat.

Turnip-shaped island just off the Michigan shore in Lake Huron.